You can wear casual shirts and jeans in summer and try a windbreaker in winter. Tall people should not wear tight clothes.
Generally speaking, thin people should try to avoid wearing dark clothes, which will make them look thinner. But it will be cool if the dark coat is well matched. Consider matching it with a white turtleneck T-shirt, or a distinctive T-shirt, pullover, shirt, etc. Which one will look good. You should see more about how boys in fashion magazines and Japanese and Korean magazines match their clothes. If you want elegance, you can use the same color system. If you want fashion, you can choose contrast color. Sometimes changing your hairstyle will give people a brand-new feeling.
You can wear a striped T-shirt in spring and summer. The kind with lapels and buttons in the middle. Casual and formal. Wear jeans below. Everything has to be high-end
You can wear a jacket in autumn. The lower part of it is generally more relaxed and casual, which can cover up your too thin waist.
You can also wear woolen pants and jeans. Spring, summer and autumn are not suitable for wearing light and rickety pants, because people are too thin and will look too floating.
In short, pants have some texture.
Wear more light-colored clothes, which have a sense of swelling, and wear less dark clothes.
Whether it's pants or tops, try to dress with texture, which is quite shaved.
This will cover up the thin figure and increase the handsome masculinity.
In short, matching clothes must look energetic and don't give people the feeling of weakness.
One more thing, if your skin is white, you can match your clothes better. If it is a little dark, you must pay special attention to your clothes, not too white or too dark, but neutral.